us. it started at 11:15 last night on contra costa boulevard. cbs 5 reporter cate caugiran is out there live with the latest. >> reporter: i just spoke with the fire inspector who says he will talk to us in a moment to update us. you can see there's a little aftermath of last night's fire. you can see it's still dark inside there. but there are crews working busy, contractors there trying to board up parts of the walls inside. but let's look at video from earlier. investigators found this suspicious molotov cocktail a makeshift bomb on the scene. that's one of the reasons they are thinking this could be a suspicious fire. contra costa fire protection district says it started around 11:15 last night at this shopping center in the 500 block of contra costa boulevard. >> there's a lot of smoke and fire alarms going off. at this point we consider it suspicious and we have an investigator on the way. >> reporter: it took crews about 20 minutes to put it out. no one was injured. back out live,